Phone TurboTax Support on Monday and tell them what happened re: the two accounts, having already paid for PLUS in other account, etc. They shouldn't charge you since you already paid for PLUS. You can also tell them you're being audited if you want any help with that.
Hours are 5AM-5PM Pacific (8AM-8PM Eastern) Monday-Friday.
FAQ: What is the TurboTax phone number?
https://ttlc.intuit.com/questions/1899263
